While this may be frustrating for those working hard to achieve a healthier weight, the good news is that even yoyo weight loss may have benefits: Engber cites a mouse study that found obese mice who lost significant amounts of weight, then regained some of it, then lost it again, etc. Ultimately, this may mean that the benefits of major weight loss lie in the journey, not the end-weight.
Accepting the science behind this and parsing it further can put an end to the kind of fat-shaming diet culture that makes us feel bad about ourselves when we regain weight after a diet, and promote a long-view of weight and good health — which like anything in life, is full of ups and downs.
Follow us. Newsletter Exclusive news delivered to your inbox. The Fail Diet. Dec 18, Share. Tags diet The Fail Diet weight. See all articles by Liesl. Latest Health articles. Losing weight by changing your habits and taking your time is much healthier than losing weight quickly. A healthy rate of loss is 1 or 2 pounds per week.
That rate is likely to mean your metabolism and body will adapt over time and the weight will have more of a chance off staying off. Also, it gives you an opportunity to evolve your eating and exercise habits to maintain a more healthy lifestyle, which is an effective method of maintaining a healthy weight. Alex O'Meara. Most people who lose weight fast don't keep it off permanently. Video of the Day. Rebound Dieting.
Regain Reasons. But when most of the weight loss is fat, we would expect to see only a small drop in RMR, as fat is not metabolically very active. What is surprising is that relatively large drops in RMR are quite common among individuals who lose body fat through diet or exercise. Most people cannot fit this activity level into their lifestyle. Metabolic activity is dependent on oxygen delivery to the tissues of the body. This occurs through blood flow. As a result, cardiac output is a primary determinant of metabolic activity.
The adult body contains about four to five liters of blood, and all of this blood should circulate throughout the body every minute or so. However, the amount of blood the heart can pump out with each beat is dependent on how much blood is returned to the heart between beats. The veins in our body are are quite flexible and can expand many times their resting size, and our soft skin also allows lower body volume expansion.
As a result, when we are sitting quietly, blood and interstitial fluid the fluid which surrounds all the cells in our body pools in the lower parts of the body. This pooling significantly reduces the amount of fluid returning to the heart, and correspondingly, reduces how much fluid the heart can pump out during each contraction.
This reduces cardiac output, which dictates a reduced RMR. Our research has shown that for typical middle-aged women, cardiac output will drop about 20 percent when sitting quietly. For individuals who have recently lost weight, the fluid pooling situation can be greater because their skin is now much looser, providing much more space for fluids to pool. This is especially the case for people experiencing rapid weight loss, as their skin has not had time to contract.
For young, healthy individuals, this pooling of fluid when sitting is limited because specialized muscles in the calves of the legs — the soleus muscles — pump blood and interstitial fluid back up to heart. Moreover, excessive fluid pooling can create a vicious cycle. Fluid pooling reduces RMR, and reduced RMR means less body heat generation, which results in a further drop in body temperature; people with low RMR often have persistently cold hands and feet.
0コメント